A complete Java Object-Oriented Programming (OOP) project demonstrating core programming concepts with a practical banking application.
This project implements a fully-functional bank account management system that showcases essential OOP principles through a menu-driven console application. Developed over 5 days with incremental GitHub commits, it serves as an excellent portfolio piece for Java developers.
This project demonstrates:
- Classes and Objects: Modeling real-world banking entities
- Encapsulation: Data hiding with private fields and public methods
- ArrayList: Dynamic collection management for multiple accounts
- Exception Handling: Comprehensive error management
- Input Validation: Robust user input verification
- Menu-driven Interface: User-friendly console interaction
- Create new accounts with auto-generated 12-digit account numbers
- View all accounts with detailed information
- Search accounts by holder name (partial match)
- Update account holder names
- Automatic transaction history for all account changes
- Deposit Money: With validation and transaction limits
- Withdraw Money: With balance verification and daily limits
- Check Balance: Real-time account balance display
- Transfer Funds: Secure transfers between accounts with rollback capability
- Complete record of all transactions
- Timestamped entries with unique IDs
- Transaction types: DEPOSIT, WITHDRAWAL, TRANSFER_IN, TRANSFER_OUT
- Detailed transaction descriptions
- Input validation for all user entries
- Transaction limits (deposit: R1M, withdrawal: R50K, transfer: R100K)
- Account number verification
- Name validation with character restrictions
- Amount validation with decimal precision
- Color-coded console output
- Formatted tables and professional displays
- Confirmation prompts for critical operations
- Clear error messages with recovery suggestions
- System pause between operations
src/ ├── com/obcodes/bankaccountmanagementsystem/ │ ├── Account.java # Main account class with all operations │ ├── Transaction.java # Transaction record class │ ├── BankAccountManagementSystem.java # Main application with menu system │ └── Menu.java # Menu display class
- Java Development Kit (JDK) 8 or higher
- Command line terminal or IDE
# Navigate to src directory
cd src
# Compile all Java files
javac com/obcodes/bankaccountmanagementsystem/*.java
# Run the application
java com.obcodes.bankaccountmanagementsystem.BankAccountManagementSystem
Using an IDE (NetBeans/Eclipse/IntelliJ)
Import the project as a Java application
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BANK ACCOUNT MANAGEMENT SYSTEM v1.0
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BANKING SYSTEM MAIN MENU
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Account Management:
1. Create New Account
2. View All Accounts
3. Search Account by Name
9. Update Account Holder Name
Transactions:
4. Deposit Money
5. Withdraw Money
6. Check Account Balance
7. Transfer Money Between Accounts
Reports & History:
8. View Transaction History
System:
10. Exit System
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Enter your choice (1-10): 1
Run BankAccountManagementSystem.java as the main class
🔧 Technical Implementation
Core Classes
1. Account Class
Encapsulation: Private fields with public getters/setters
Methods: deposit(), withdraw(), transfer(), checkBalance()
Validation: Built-in validation for all operations
History: Maintains complete transaction records
2. Transaction Class
Immutable: Once created, transactions cannot be modified
Tracking: Records type, amount, timestamp, and balance
Formatting: Professional display formatting
3. BankAccountManagementSystem Class
Controller: Main application logic
Menu Handling: 10-option menu system
Validation: Comprehensive input validation
Error Handling: Graceful error recovery
4. Menu Class
Separation of Concerns: Dedicated menu display logic
User Interface: Professional formatting and colors
Key OOP Concepts Demonstrated
Encapsulation
Private fields with controlled access
Validation within setter methods
Immutable transaction records
Abstraction
Complex banking operations simplified through methods
Hidden implementation details
Data Structures
ArrayList for dynamic account storage
Transaction history tracking
Error Handling
Try-catch blocks throughout
Custom exception messages
User-friendly error recovery
📈 Development Timeline
Day 1: Foundation
Basic Account class with encapsulation
Account number generation
Initial menu structure
Day 2: Core Operations
Complete deposit and withdrawal functionality
ArrayList management for multiple accounts
Enhanced menu system
Day 3: Advanced Features
Money transfer between accounts
Transaction confirmation
Improved user interface
Day 4: History & Search
Transaction history tracking
Account search by name
Enhanced error handling
Day 5: Final Polish
Complete input validation
Professional error handling
Color-coded interface
Final documentation
🧪 Testing Features
The system includes:
5 pre-loaded test accounts
Sample transactions for demonstration
Boundary testing for all validations
Error scenario handling
📝 Code Quality Features
JavaDoc Comments: Comprehensive documentation
Meaningful Naming: Descriptive variable and method names
Modular Design: Separation of concerns
Constants Usage: No magic numbers
Formatting: Consistent code style
🎓 Educational Value
This project is ideal for:
Java beginners learning OOP concepts
Students preparing for programming interviews
Developers building portfolio projects
Understanding real-world application development
🔮 Future Enhancements
Potential improvements for extended learning:
File persistence for data storage
Database integration
GUI interface
Web application version
Additional account types (Savings, Business)
Interest calculation
Email notifications
👨💻 Author
Obakeng Phale
Java Developer
GitHub: @obcodes
📄 License
This project is open source and available for educational purposes.